Create test app with one JFrame containing small modeled JTable with editable cells, and a JTextField. Run app, double click in JTable instance cell to begin edit; change cell contents (but don't hit return to terminate edit); click in JTextField instance; notice lack of edit end in cell; click back in cell - notice edit continues.

"Correct" functionality would have cell noticing that it has lost focus, go through the processes of invoking a editingStopped(...) call on it's owning JTable instance.